<div style="margin-top: 30px;">
<form action="" enctype="multipart/form-data" method="post">
  <select name="skola_id">
    <option value="0">Skola</option>
    <?php foreach($skolas as $skola) {?>
    <option value="<?php echo $skola->getId() ?>"><?php echo (string)$skola ?></option>
    <?php }?>
  </select>
  <input type="file" value="" id="userfile" name="userfile"/>
  <input type="submit" value="Importuj" name="commit"/>
</form>
</div>